6Ph2). Combining the structural data for 1 and 2 with those of other alkyl, aryloxide compounds of niobium(V) and tantalum(V) shows that the MOAr distances span a narrow range of 1.85-1.95 A, while the corresponding MOOAr angles vary from 135 to 180° with no correlation between the two parameters. Crystal data for TaO3C36H37 (1) at 19°C: a = 19.313(3), b = 11.652(1), c = 15.288(1) A, β = 113.13(1)°
摘要处理二
氯化钽化合物Ta(OAr-2,6Me2)3Cl2或Ta(OAr-2,6Pr2i)3Cl2(OAr-2,6Me2 = 2,6-二甲基苯氧基; OAr-2,6Pr2i = 2,6-二异丙基苯氧化物)与
苯基锂(2当量)导致形成双苯基化合物Ta(OAr-2,6Me2)3(
C6H5)2(1)和Ta(OAr-2,6Pr2i)3( )2(2 )分别以中等收益率投放。1和2的单晶X射线衍射分析表明它们是同构的。在这两种化合物中,围绕
金属中心的三角双锥体环境都是明显的,带有反式,轴向芳基氧化物氧原子。存在短的TaO距离,范围为1.848(5)-1.881(3)A,并且几乎呈线性的TaOAr角。1和2中的中心配位环境与双环
金属化化合物Ta(OC6H3Ph-
C6H4)2(OAr-2,6Ph2)的发现非常相似。将1和2的结构数据与
铌(V)和
钽(V)的其他烷基,芳氧基化合物的结构数据结合起来,可以看出MOAr的距离跨在1